DESIGN AND FABRICATION OF A PEDAL POWERED DRILLING UNIT

ABSTRACT

Sub-Saharan Africa is a region whose energy sector is relatively under developed, taking this into context, Kenya is a country in which statistically only 23% of the population have access to electricity [1], therefore economic growth and industrialisation is stunted. Thus solutions to the issue of industrialization must be unearthed to improve economic growth. This project report focused on a simple solution that is a pedal powered drilling unit in order to help industrialization on a small scale within rural and Jua Kali (open air) workshops. The Jua Kali sector is an informal industry that mainly uses fabrication of scrap metal as a production process, thus arises a target market for the pedal powered drilling unit product due to unsustainability of electricity in workshops.
The pedal powered drilling unit is a machine whose platform is designed from a recycled bicycle frame where the pedal operated mechanism is used to power the drill. The design mainly took advantage of a chain drive mechanism for power transmission, a flywheel for conservation of momentum and various gear ratios for power amplification. The project development team aimed to improve specific aspects of the design such as efficiency, ergonomics, mobility and compactness of the design through use of cost effective locally available materials.
This project was founded with theory based on mechanics of machines. Research work set the foundation for design and the project used AutoCAD a computer aided design software for the drafting and simulation of the product prototype. The fabrication process employed various engineering manufacturing techniques (welding and sheet metal working) to actualise the design.
For the team to assess cost effectiveness of the product, material selection was constrained by a set project budget.